>>211647832
Probably just geopolitics. We supported them a lot after independence while the US tried to bully them. Plus cultural exchange programs. After the war in South Tibet/Arunachal Pradesh the ideas of the 5 principles of peaceful coexistence and "hindi chini bhai-bhai" became obsolete and they found a new friend, and rebranded the idea as "hindi rusi bhai bhai". Khrushchev even ordered one middle school in Moscow to teach hindi as a subject